Hottest high barrier inner layer material

2022-08-07
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High barrier inner layer materials

in recent years, China's food packaging has been greatly developed and improved. The first packaging materials with common barrier properties (such as bopp/ldpe, bopet/cpp, bopa/lope, etc.) have been applied. Packaging materials with high barrier performance (such as bopp/pvdc/ldpe, bopet/pvdc/cpp, bopp/al/ldpe, bopa/pvdc/cpp, etc.) have been widely used today. There are three recognized high barrier materials in the world: aluminum foil, PVDC and EVOH. Because aluminum foil is expensive and needs to be μ M can eliminate the pinhole problem. Therefore, the greatest effect of most aluminum plating processes used to replace aluminum foil in packaging is to avoid light. ten μ Mevoh has a barrier performance comparable to that of aluminum foil in the dry state, but its barrier performance drops rapidly in the humid and hot conditions, and is only about the same as that of ordinary BOPET at 90%rh. Compared with aluminum foil, PVDC material can reduce a lot of materials and will not affect the barrier performance in the hot and humid state

therefore, most countries have developed the production of PVDC materials. Nowadays, PVDC materials are highly appreciated in the international market. China has also invested in several VDC production lines, the basic use method of P electronic extensometer on electronic universal testing machine, specializing in the production of PVDC coating films. Since the development of PVDC coating film, in addition to the traditional coating on the film after biaxial stretching (including BOPP, BOPET, BOPP matting film, BOPA, etc.), the process of coating on the non stretched film (including CPP, CPE, etc.) has been successfully developed in China, which means that the accumulation of residual film pollution will cause production loss, and its barrier performance is no less than that of the former

in previous years, due to the restriction of production equipment, domestic PVDC coating film (coating is 2 μ m) The film after bi-directional stretching is mainly used as the base material, and its oxygen transmission can be controlled at 10.15cm3/m2 · 24h. Various coated films are widely used in the field of food packaging such as moon cake and SaQima, and Boba coated film is well used in the field of cooking resistant packaging. In the 21st century, after China's entry into WTO, the international PVDC latex market has been gradually opened to China, and China's PVDC coating products have been greatly developed. First, the domestic PVDC latex production lines were increased to two, and the coating film was mainly used for the outer packaging of cigarettes; Secondly, the domestic PVDC coating industry has continuously improved, perfected and matured the production process. Nowadays, the barrier properties of PVDC coating films based on biaxially oriented films have been greatly improved. E.g. BOPP coated film (coating is 2 μ m) Oxygen transmission index decreased to 5 ~ 10cm3/m2 · 24h, BOPA coated film (coating is 2 μ m) The oxygen permeability index has dropped to 3 ~ 7cm3/m2 · 24h, which will be greatly improved with the maturity and stability of the coating industry

up to now, the barrier performance of high barrier film has been able to meet the requirements of food packaging since june1,2008. However, China has continued to use high barrier film post press compounding, resulting in a small amount of residual solvent or residual odor can not volatilize. Now, Zhejiang Jinhua Baihui Packaging Co., Ltd. has successfully developed CPP coating film for the first time. Therefore, 1 it is necessary to regularly check the temperature, vibration, internal wires, etc. of electromechanical equipment, and the oxygen transmission of CPE coating film (the coating is 2 μ m) Controlled below 15cm3/m2 · 24h. As the inner layer and heat sealing layer, the non stretched film coating film appears on the plastic packaging bag. With its excellent barrier property, it fundamentally solves the possibility that the ink residual solvent and residual odor that may be produced by the ink printing layer may contact with food. The inner layer of liquid pesticide packaging has always been made of imported non stretched high barrier film, which is mainly to prevent pesticides from penetrating the inner layer and affecting the printing layer. For more than a decade, domestic materials can not be used to replace it. CPP coated film fills this gap. Today, with the increasing awareness of food safety and hygiene, the use of high barrier materials in the inner layer of food packaging bags will be a new highlight

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